x=0:1:3;
y=[0.90638,0.89445,0.88889,0.88873];
plot(x,y,'-b.','LineWidth',2,'Markersize',16)
xlabel('K')
ylabel('RMSE')
set(gca,'xlim',[0,3]);
set(gca,'xtick',0:1:3);
set(gca,'xticklabel',[10,20,50,100]);
set(gca,'ylim',[0.85,0.95]);
set(gca,'ytick',0.85:0.02:0.95);
set(gca,'yticklabel',0.85:0.02:0.95);
